Cannula



FIG. 1 is a fight side view of the cannula of the present invention, shown at a larger scale;

FIG. 2 is a left side view thereof, shown at a larger scale;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a back view thereof; and,

FIG. 7 is a front perspective view thereof. 

The ornamental design for a cannula, as shown and described. 